c. Precautions. The flame from a blowtorch or oxyacetylene torch can produce
intense heat and should not be used close to flammable substances, nor should it be
used for soldering wires or components around engines. The intense heat may burn
the insulation from wires and other components. When torches must be used in a
confined space, it is suggested that all demountable parts be removed for the
soldering operation. This will prevent possible damage to those parts.
EXERCISE
45.
What type of joint would be made when brazing two plates 1/4 of an inch thick
or more?
a.
V-groove
b.
Butt
c.
Scarf
46.
What type of flame gives the best results when brazing?
a.
Neutral
b.
Oxidizing
c.
Reducing
47.
What type of solder would normally be used to repair radiators?
a.
60/40
b.
50/50
c.
30/70
48.
Which type of soldering flux is noncorrosive?
a.
Borax
b.
Zinc chloride
c.
Rosin
49.
What type of flame is used to solder using oxygen-acetylene equipment?
a.
Oxidizing
b.
Reducing
c.
Neutral
50.
a.
Soldering iron is moved too slow
b.
Improper flux
c.
Insufficient heat
36. SUMMARY. In this lesson we have discussed safety as applied to oxygen and
acetylene welding and cutting operations; setting up oxygen and acetylene welding
equipment for welding, brazing, soldering, and cutting operations; and soldering
methods using soldering irons both electric and nonelectric. All operations should
be performed systematically in order to avoid mistakes. There are many ways to
bond metal as was shown by the welding process chart, but only the methods you will
be mostly associated with in the field and in normal operations have been listed.
You should have learned enough to properly supervise the use of equipment covered
by this lesson.
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